16971999660 has 1296 divisors, whose sum is σ = 74174929920. Its totient is φ = 3233260800.

The previous prime is 16971999659. The next prime is 16971999661. The reversal of 16971999660 is 6699917961.

It is an interprime number because it is at equal distance from previous prime (16971999659) and next prime (16971999661).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16971999661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 547483845 + ... + 547483875.

Almost surely, 2^16971999660 is an apocalyptic number.

16971999660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16971999660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37087464960).

16971999660 is an abundant number, since it is smaller than the sum of its proper divisors (57202930260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16971999660 is a wasteful number, since it uses less digits than its factorization.

16971999660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 9920232, while the sum is 63.

The spelling of 16971999660 in words is "sixteen billion, nine hundred seventy-one million, nine hundred ninety-nine thousand, six hundred sixty".